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Liquid Crystals for Organic Field-Effect Transistors

  • Mary O’NeillEmail author
  • Stephen M. Kelly
Chapter
Part of the Springer Series in Materials Science book series (SSMATERIALS, volume 169)

Abstract

Columnar, smectic and lamellar polymeric liquid crystals are widely recognized as very promising charge-transporting organic semiconductors due to their ability to spontaneously self-assemble into highly ordered domains in uniform thin films over large areas. The transport properties of smectic and columnar liquid crystals are discussed in  Chaps. 2 and  3. Here we examine their application to organic field-effect transistors (OFETs): after a short introduction in Sect. 9.1 we introduce the OFET configuration and show how the mobility is measured in Sect. 9.2. Section 9.3 discusses polymeric liquid crystalline semiconductors in OFETs. We review research that shows that annealing of polymers in a fluid mesophase gives a more ordered microcrystalline morphology on cooling than that kinetically determined by solution processing of the thin film. We also demonstrate the benefits of monodomain alignment and show the application of liquid crystals in light-emitting field-effect transistors. Some columnar and smectic phases are highly ordered with short intermolecular separation to give large π-π coupling. We discuss their use in OFETs in Sects. 9.4, and 9.5 respectively. Section 9.6 summarises the conclusions of the chapter.

Keywords

Liquid Crystal Organic Semiconductor Hole Mobility Charge Carrier Mobility Liquid Crystalline Polymer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Authors and Affiliations

  1. 1.Department of Physics and MathematicsUniversity of HullHullUK
  2. 2.Department of ChemistryUniversity of HullHullUK

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